🚀 go-pugleaf

Andrew (Enviro@measure.demon.co.uk) wrote:
: In article <01bb8a8a.b7439480$LocalHost@spab1285>
:            ange.brunner@span.ch "BRUNNER Ange" writes:
: 
: > If you know the quartz very well; i have a question for you.
: > 
: > I want to know if a quartz accelerometer is sensible to transverse
: > acceleration.

Some of my most sensible accelerometers are quartz   ;-)

: Generally accelerometers are much less sensitive to transverse
: acceleration than forward acceleration - typically about 30 dB less
: sensitive. Some accelerometers are marked with a red spot or similar
: to indicate the direction of minimum transverse sensitivity.
: 
: Andrew Silverman
: -- 
: Enviro@measure.demon.co.uk

Concur with Andrew.  The good piezo materials (quartz, PbZrTi, &c) are
all quite insensitive to transverse vibration.  But it comes down to good
accelerometer construction to optimise it.  

Generally I steer clear of compression types in favour of ring shear or 
delta shear types, for their better resistance to thermal gradients.  
(Cold accelerometer + hot machine = dc offset voltages;
 i.e. skewed time domain traces with ac coupling)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- 
Bruno Karlin, BE(Mech)  ~~~Vibration Analysis & Monitoring~~~
bk@sydney.dialix.oz.au  Busn +612 95622404  Fax +612 95622451 ()()()
 Mail: ADI Ltd, Box 4W  Garden Island, SYDNEY 2000, AUSTRALIA  ()()

  . . . my opinions, their mailbox!